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Chelatometric Titration of Bismuth with Gallein Indicator
Author(s) -
Sun PengJoung
Publication year - 1961
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.196100008
Subject(s) - chemistry , titration , bismuth , magenta , nitric acid , inorganic chemistry , end point , salt (chemistry) , ion , nuclear chemistry , organic chemistry , materials science , geometry , mathematics , inkwell , composite material
A method using gallein as indicator for the direct titration of bismuth with disodium salt of EDTA was devised. The titration was carried out in nitric acid. The optimum p H for the titration was found to be at p H. 1.3 to 2.3. The sharpest end point occurred at around p H 1.7. The end point was reached when the magenta color gave place to a pale yellow. The interference of approximately equimolar concentration of various foreign ions was studied. By the proposed method bismuth can be accurately titrated in the presence of a variety of both cations and anions including large amounts of lead ions.